Gen 3 Prius Knocking Start Mystery Solved 2ZR-FXE Engine
Автор: friendlyjacek
Загружено: 2013-03-03
Просмотров: 250569
Here is what I did. First I recorded a normal ICE start (0:23). Then I disconnected one of the ignition coils to produce misfire in one cylinder and restarted. Sure enough, characteristic knock was produced (1:10). Then I reconnected the coil and restarted the engine again with no problems. I had to clear a the code about disconnected coil using Torque app loaded on Android tablet.
This source explains why knocking is produced when misfiring in Prius: http://www.aecs.net/techniek2012/Marc...
Apparently MG kicks in and out to compensate for the detected misfiring. As for why some rare Prius starts have self limiting misfire on cold start, my best guess is moisture in combustion chambers and intake from a previous cold shutdown temporarily shorts a spark plug.
I haven't had one of these knocking starts in my 2010 Prius before this experiment, but I believe they are harmless.
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